Re: Version II of Low-cost retail CO2 bottles?

On 7/28/05 9:39 AM, in article Q1GejDH4oQ6CFwjV@xxxxxxxxxxxxxxxxx, "David
Littlewood" <david@xxxxxxxxxxxxxxxxxx> wrote:

> (3) Buy a Kipps generator (they come up on eBay) and use it with marble
> chips (CaCO3) and dilute sulphuric or hydrochloric acid*. The way these
> work (Google it) would allow you to produce slow or intermittent
> controlled amounts as needed.

David:

Do you know the highest pH at which calcium carbonate will decompose to
produce carbon dioxide? I was able to obtain generalized instructions on how
to calculate that, but I have more to learn before being able to do so. I am
trying to find out if I can use limestone to keep my hydroponic nutrient
solution from becoming too acid.

Bill

.